Transmitting apparatus for wireless telegraphy.



A. H. JOHNSON.

TRANSMITTING APPARATUS FOR'WIRELESS TELEGRAPIIY.

APPLICATION FILED NOV- I4, I912. 1,145,066. Patented July 6, 1915.-

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UNITED STATES PATENT FIGE.

ALBERT H. JOHNSON, OF WASHINGTON, DISTRICT OF COLUMBIA, ASSIGNOR TONATIONAL ELECTRICAL SUPPLY COMPANY, 015 WASHINGTON, DISTRICT OFCOLUMBIA, A CORPORATION OF VIRGINIA.

TRANSMITTING APPARATUS FOR WIRELESS TELEGRAPHYL Specification of LettersPatent.

Patented July 6, 1915.

Application filed November 14, 1912. Serial No. 731,382.

To all whom it may concern:

, Be it known that I, ALBERT. H. JOHN- SON, a citizen of the UnitedStates, residing at \Vashington, in the District of Columbia, haveinvented certain new and useful Improvements in Transmitting Apparatusfor Wireless Telegraphy, of which the following is a specification.

This invention relates to certain new and useful improvements intransmitting apparatus for wireless signaling which, while adaptedforgeneral use in the art, are particularly valuable and important intheir application to portable generating sets for wireless telegraphy.

An important object of this invention is to provide transmittingapparatus for wireless telegraphy which can be operated with the minimumapplication of power.

Another object of this invention is to prov vide a portable, manuallyoperated, prefer-.

ably self contained generating set for wireless transmission vwhich islight in weight, simple in construction, convenient to use and capableof providing current for wireless communication throughout a wide area.

Other objects and advantages of this invention will be apparent from thefollowing specification wherein reference is made to the accompanyingdrawings showing, for purposes of illustration, a diagrammatic view oftransmitting apparatus and circuit thereof involving my invention.

In the drawing, 1 represents the armature winding of a generator orexciter 2, preferably a shunt wound direct current generator or exciter,having brushes 3 and 1 separately connected in parallel as shown withthe field 5 of the exciter 2 and with the field 6 of a generator 7,preferably an alternating current generator, whose armature 8 ismechanically connected by the shaft 9 with the armature 1. The armaturewindings 1 and 8 are preferably wound upon the same armature shaft. Atransmitting key 10 is included in circuit with the armature winding 1and'the field 6. I

The brushes 11 and 12 of the generator 7 are connected, as shown, withthe primary winding 13 of a transformer 14. The ends of the secondarywinding 15 of the transformer 14 may be connected respectively with theaerialconduc'tor A and with the earth connection E, these conductorsbeing in electrical communication with the spark tice. v

The shaft 9 carrying the armature windings of the generators 2 and 7 maybe rotated by any suitable means. In the preferred form of my inventionthe shaft 9 is manually operated .by means of the cranks 17, and 18mounted upon the ends of a suitably supported shaft 19 which may carry alarge sprocket wheel 20, power being supplied to a small sprocket 21 onshaft 9 by means of a sprocket chain 22. Each crank is designed andarranged to be gap 16, in accordance with the usual prac-- operated byone or more men. Mounted upon the armature shaft 9 is a fly wheel 23whlch in my invention serves the important purpose of storing up energywhen .the transmitting key 10 is open, and the shaft 9 accordinglycapable of being easily rotated,

and giving out energy when the transmit-.

ting-key 10 is closed and the armature shaft requires more power toeffect its rotation.

The-method of operation of my apparaing rotated by any suitable meanspreferably manually bythe operation ofthe. cranks 17 and 18, current isgenerated in the armature winding 1 and its field 5 is energized. Whenthe transmitting key 10 is open there is no circulation of current from'the excitor 2 through. the field 6 of the generator 7 and, consequentlylittle resistance is offered to the rotation of the armature 8. Theshaft 9 is relatively easily rotated and considerable energymay bestored up in the fly wheel, 23. When the transmitting key 10 is closedthe field 6, of the generator 7 is energized and a suitable currentgenerated in the armature 8, which passes from ,brush- 11 through theprimary coil 13 of the tus is as follows: The armature shaft 9betransformer 11 back to the brush 12. As I the field 6 wereenergizedcontinuously instead of intermittently as described. It willtherefor be apparent that by my improvement it is possible to secure amaterially greater range of wireless communication from power exerted bymen laboring at the operating cranks than would otherwise-be possible. II

While I have shown .and described the preferred form of my apparatus itis to be understood that numerous changes may be made in the form anddetails of construction without. departing from the spirit of myinvention or the scope of the subjoined claims.

Having described my invention,I claim l. In transmitting apparatus forwire-less signaling, an alternating current generator to supply thetransmitting current, a direct current generator adapted and arranged tosupply current to'the field of the alternating current generator, atransmitting key in circuit with the direct current generator, and thefield of the alternating current gen- .erator whereby the field ofthealternating current generator is energized by the direct currentgenerator only when the key is closed, the armature windings of bothgenera'tors being mounted upon the same arma- 30 ture shaft, and meansfor storing up surplus energy imparted to the shaft when thekey is openand imparting it to the shaft when the key is closed whereby thearmature shaft may be operated at a substantially uniform speed from asmall energy source.

2. In transmitting apparatus for wireless signaling, an electricgenerator, a separate source of current adapted to energize the field ofsaid generator, a transmitting key between the said field and the sourceof current and a fly wheel fixed upon the armature shaft of thegenerator adapted 'to store up excess energy imparted to the shaft whenthe key is open and to impart it to the shaft when the key is closedwhereby the armature shaft may be operated at a substantially uniformspeed from a small energy source.

3. In transmitting apparatus for wireless signaling, an electricgenerator, a separatesource of current adapted to energize the field ofsaid generator, a transmitting key between the said field and the sourceof current, a fiy wheel fixed upon the armature shaft of the generatoradapted to store up excess energy imparted to the shaft when the key isopen and to impart it to the shaft when the key is closed, and manuallyopera-' ble means to rotate the said armature shaft.

4. In transmitting apparatus for wireless signaling, an electricgenerator to supply the transmitting current, an electric generatoradapted and arranged to act 'as an exfciter for the first namedgenerator, the armature of the exciter being connected .in',

parallel with the fields of the exciter and transmitting generator, atransmitting key in circuit with the field of the transmittinggenerator, common manually operated means to effect the rotation of thearmatures of the exciter and transmitting generator, and means forstoring up energy from such rotation means when the transmitting key isopen and utilizing it in the rotation of the armatures when the key isclosed.

5. In transmitting apparatus for wireless signaling, an electricgenerator to supply the transmitting current, an electric generator orexciter adapted and arranged to supply current to the field of thetransmitting generator, a transmitting key in circuit'between the saidfield and the exciter whereby the saidfield is energized by the'exciteronly when the key is closed and means for storing up surplus energyimparted to the shaft of the exciter when the key isopen and impartingit to the shaft when the key is closed whereby such armature shaft maybe operated at a substantially uniform speed from a small energy source.

6. In transmitting apparatus for wireless signaling, an electricgenerator to supply the transmitting current, an electric generatoradapted and arranged to act as an exciter for the first named generator,a key in circuit between the exciter and the transmitting generator,common manually operated means to effect the rotation of the arerator, atransmitting key in the circuit between the said field and the exciterwhereby the said fieldis energized by the exciter only vwhen the key isclosed, the armature windings of the two generators being mounted uponthe same armature shaft, and means for storing up surplus energyimparted to the said shaft when the key is open and imparting it to saidshaft when the key is closed whereby the said shaft may be operated at asubstantially uniform speed from a small energy source.

8. In transmitting apparatus for wireless signaling, an electricenerator to supply the transmitting current, an electric generator orexciter adapted and arranged to supply current to the field of thetransmitting generator, a transmitting key in the circuit between thesaid 'field and the exciter whereby the said field is energized by theexciter only when the key is closed, the armature windings of the twogenerators being mounted upon the same armature shaft, and a fiy-wheelfixed upon'the said shaft whereby when signals are being sent, thearmature shaft may be operated at a substantially uniform speed from asmall energy source.

9. In transmitting apparatus for wireless signaling, an alternatingcurrent generator to supply the transmitting current, a direct currentgenerator adapted and arranged to supply current to the field of thealternating current generator, a transmitting key in circuit with thedirect current generator and the field of the alternating currentgenerator whereby the field of the alternating current generator isenergized by the direct current generator only when the key is closed,means to efiect the rotation of the armatures of the alternating currentand direct current genera-tors and means for storing up surplus energyimparted to the armature shaft of the alternating current generator whenthe key is open and imparting it to the said shaft when the key isclosed whereby the armature of the alternating current generator may berotated at a substantially uniform speed from a small energy source.

. In testimony whereofI afiix my signature in presence of two witnesses.

TALBERT H. JOHNSON.

Witnesses:

HENRY B. DE Gnoo'r, CHAS. O. REED.

